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. Author manuscript; available in PMC: 2013 Aug 14.
Published in final edited form as: J Epidemiol Community Health. 2009 Feb 19;63(6):500–504. doi: 10.1136/jech.2008.080499

Table 1.

Risks of an adverse pregnancy outcome for four mutually exclusive cohorts of pregnant women.

Time 1 Time 2
Location 1 Risk11 Risk12
Location 2 Risk21 Risk22